While on a router console we run quite a no. of commands. Some commands execute immediately and other require some time to finish. Some of them are waiting for the user input. For example if we open a telnet session within the router console or router telnet session, then we need some way to come [...]
First we look at what exactly NAT is? It means Network Address Translation. This technology or technique was developed to overcome the shortage of public IP addresses in IPv4 standard. With the invent of NAT, the problem of shortage of public IP addresses has been solved quite a bit. Now we have moved to IPv6 [...]
This is a fairly easy question but if you’re a newbie in Cisco routers, then this can be a handy guide to tell you the details.
To see the version of IOS, there is one command which give a detailed overview of the software installed on the system (Cisco router or switch).Lets issue the command:
Certhacker#show version
The [...]
As the title suggests, I want to have a limited access to my router through telnet. I want only specific networks to be able to telnet my router. All others should be blocked from telnetting the router.
So let’s start:
Enter global config mode
Certhacker#configure terminal Enter configuration lines, one per line. [...]
Hostname is the name of the router. It’s up to us what we name it. It’s like giving a name to our own systems. If we are using a command line interface to access the router or switch, then we can see the current name of the device before the prompt.
SSH is the preferred protocol for remote communication with Cisco products. SSH is more secure than Telnet because all the data is sent with encryption.
To see if SSH in Cisco router or switch is enabled or not issue the following command:
Certhacker#show ip ssh
%SSH has not been enabled
You can see that SSH has not been [...]
Static routes are those which are manually added by a network administrator. Their purpose is to hardcode a route for a specific network or host. The opposite of a static route is dynamic route which is automatically created by the router.
The syntax to add a static route in Cisco IOS (router) is as follows:
certhacker(config)# ip [...]